The Axis ballast is designed to set and install quickly. The fixed level reduction dip-switch control can be preset right out of the box; it is then installed by a single self tapping screw to the fixture interior (outside the ballast cover.) The compact daylight sensing photocell is inserted through a drilled or punched hole in the ceiling, or through a drilled hole in a surface or suspended fixture. The photocell is then quickly secured by a room side flanged hex nut and a plenum side pressure clamp. No Additional adjustments, low voltage wiring, or remote controls are required.